The third generation billionaire’s secret heir, Dong-Ju X Secret secretary Min-Young. Lee Min-Young of the HR team happened to see Han Dong-Ju, a new employee of the sales team, coming out of the president’s office. Surprisingly, Min-Young finds out that Dong-Ju is the president’s hidden son. Moreover, he receives a secret offer to spy on his private life in order to make him his heir… “But this new employee, seems like he is flirting with me?!”